EP0788523B2 - Procédé de fabrication de revêtements multicouches - Google Patents

Procédé de fabrication de revêtements multicouches Download PDF

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Publication number
EP0788523B2
EP0788523B2 EP95936547A EP95936547A EP0788523B2 EP 0788523 B2 EP0788523 B2 EP 0788523B2 EP 95936547 A EP95936547 A EP 95936547A EP 95936547 A EP95936547 A EP 95936547A EP 0788523 B2 EP0788523 B2 EP 0788523B2
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EP
European Patent Office
Prior art keywords
mixture
weight
coating formulation
process according
molecular weight
Prior art date
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Expired - Lifetime
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EP95936547A
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German (de)
English (en)
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EP0788523B1 (fr
EP0788523A1 (fr
Inventor
Lutz-Werner Gross
Ralf Stein
Egon Wegner
Gudrun Wiemann
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BASF Coatings GmbH
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BASF Coatings GmbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/577—Three layers or more the last layer being a clear coat some layers being coated "wet-on-wet", the others not
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
    • C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes

Definitions

  • Processes for painting vehicle bodies, in particular automobile bodies, are known from the prior art known, in which an electrocoat is applied and baked, if necessary, a stone chip intermediate applied and is introduced separately or together with the filler layer to be applied, a filler is applied and is baked and a single or multi-layer top coat is applied and baked.
  • the filler layer has the particular task of filling and covering unevenness around the substrate equalize for the subsequent top coat.
  • important mechanical-technological properties of the overall finish e.g. Corrosion protection and before Resistance to stone chips and other mechanical attacks is very important to the quality of the Filler layer and - if available - the intermediate stone chip layer.
  • a corresponding method, in particular for painting vehicle bodies is, for example, from known from EP-A-238037.
  • aqueous paints are known, inter alia, from DE-OS 4005961. These The paints described are suitable in the process described here for producing filler or stone chip intermediate layers.
  • This is essentially a varnish, which is a combination as a binder contains water-thinnable polyurethane resins, water-thinnable polyester resins and amino resins.
  • EP-A-0 355 682 discloses an aqueous lacquer which is suitable for producing filler coatings is characterized by improved stone chip resistance at low temperatures and good intermediate adhesion distinguished.
  • Water-dispersible polyurethane resins are essentially used as binders. adversely however, here is the required high layer thickness of 35 ⁇ m.
  • the paint layer applied in process stage 3 has a layer thickness of approximately 35 ⁇ m applied.
  • step (3) The coating formulation according to the invention described below is used in step (3). This leads to the surprising result. the layer thicknesses of 15 ⁇ m and less can be applied without that there is a loss of quality.
  • the coating layer formulation used in stage 3 contains a) a binder which consists of a water-dilutable Polyurethane resin consists of an acid number of 10 to 60 and a number average molecular weight of 4000 to 25000, preferably 8000 to 25000, and can be produced by aa) using a polyester and / or polyether polyol a number average molecular weight of 400 to 5000 or a mixture of such polyester and / or polyether polyols, bb) a polyisocyanate or a mixture of polyisocyanates, cc) a compound which at least a group which is reactive towards isocyanate groups and at least one group capable of forming anions in the molecule has, or a mixture of such compounds and optionally dd) containing hydroxyl and / or amino groups organic compound with a molecular weight of 40 to 400 or a mixture of such compounds with one another are implemented and the resulting reaction product is at least partially neutralized, and b) Contains pigments and
  • Component (a) can be prepared from aa), bb), cc) and, if appropriate, dd) by the methods of polyurethane chemistry which are well known to the person skilled in the art (cf., for example, US Pat. No. 4,719,132, DE-OS 3628124, EP-A-89497 , EP-A-256540 and WO 87/03829).
  • Saturated and unsaturated polyester and / or polyether polyols in particular polyester and / or polyether diols with a number average molecular weight of 400 to 5000 can be used as component (aa).
  • Linear or branched polyether diols such as poly (oxyethylene) glycols, poly (oxypropylene) glycols and poly (oxybutylene) glycols are mentioned as examples.
  • the selected polyether diols should not introduce excessive amounts of ether groups, otherwise the polymers formed will swell in water.
  • the preferred polyether diols are poly (oxypropylene) glycols in the molar mass range M n from 400 to 3000.
  • Polyester diols are obtained by esterification of organic dicarboxylic acids or their anhydrides with organic ones Diols are made or derived from a hydroxycarboxylic acid or a lactone. To branched polyester polyols can produce to a small extent polyols or polycarboxylic acid with a higher valency be used.
  • the dicarboxylic acids and diols can be linear or branched aliphatic, cycloaliphatic or aromatic dicarboxylic acids or diols.
  • the diols used to prepare the polyesters consist, for example, of alkylene glycols, such as ethylene glycol, Propylene glycol, butylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol and other diols such as dimethylolcyclohexane.
  • alkylene glycols such as ethylene glycol, Propylene glycol, butylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol and other diols such as dimethylolcyclohexane.
  • polyols such as trimethylolpropane, glycerol, pentaerythritol
  • the acid component of the polyester consists primarily of low molecular weight dicarboxylic acids or their anhydrides with 2 to 30, preferably 4 to 18 carbon atoms in the molecule.
  • Suitable acids examples are o-phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, cyclohexanedicarboxylic acid, Succinic acid, adipic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, glutaric acid, hexachlorheptanedicarboxylic acid, Tetrachlorophthalic acid and / or dimerized fatty acids.
  • Anhydrides if they exist, can be used.
  • polyester polyols smaller ones can also be used Amounts of carboxylic acids with 3 or more carboxyl groups, for example trimellitic anhydride or the adduct of maleic anhydride to unsaturated fatty acids.
  • Polyester diols obtained by reacting a lactone with a diol can also be used. These are characterized by the presence of terminal hydroxyl groups and recurring polyester fractions of the formula (-CO- (CHR 2 ) n -CH 2 -O).
  • n is preferably 4 to 6 and the substituent R 2 is hydrogen, an alkyl, cycloalkyl or alkoxy radical.
  • No substituent contains more than 12 carbon atoms.
  • the total number of carbon atoms in the substituent does not exceed 12 per lactone ring.
  • Examples include hydroxycaproic acid, hydroxybutyric acid, hydroxydecanoic acid and / or hydroxystearic acid.
  • the unsubstituted ⁇ -caprolactone in which n has the value 4 and all R substituents are hydrogen, preferred.
  • the reaction with lactone is carried out by low molecular weight polyols, such as ethyl glycol, 1,3-propanediol, 1,4-butanediol, dimethylolcyclohexane.
  • low molecular weight polyols such as ethyl glycol, 1,3-propanediol, 1,4-butanediol, dimethylolcyclohexane.
  • other reaction components such as ethylenediamine, alkyldialkanolamines or urea can be reacted with caprolactone.
  • Polylactam diols which are produced by reaction of, for example, ⁇ -caprolactam are also suitable as higher molecular weight diols is produced with low molecular weight diols.
  • Aliphatic and / or cycloaliphatic and / or aromatic polyisocyanates can be used as component bb) be used.
  • aromatic polyisocyanates are phenylene diisocyanate, tolylene diisocyanate, Xylylene diisocyanate, biphenylene diisocyanate, naphthylene diisocyanate and diphenylmethane diisocyanate.
  • (cyclo) aliphatic polyisocyanates Due to their good resistance to ultraviolet light, (cyclo) aliphatic polyisocyanates produce products with a low tendency to yellowing. Examples include isophorone diisocyanate, cyclopentylene diisocyanate, and hydrogenation products of aromatic diisocyanates such as cyclohexylene diisocyanate, methylcyclohexylene diisocyanate and dicyclohexylmethane diisocyanate.
  • Aliphatic diisocyanates are compounds of the formula OCN- (CR 3 2 ) r -NCO, where r is an integer from 2 to 20, in particular 6 to 8, and R 3 , which may be the same or different, is hydrogen or a lower alkyl radical with 1 represents up to 8 carbon atoms, preferably 1 to 2 carbon atoms.
  • Examples include trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, propylene diisocyanate, ethylethylene diisocyanate, dimethylethylene diisocyanate, methyltrimethylene diisocyanate and trimethylhexane diisocyanate.
  • Isophorone diisocyanate and dicyclohexylmethane diisocyanate are particularly preferred as diisocyanates.
  • Component bb) must be composed in terms of the functionality of the polyisocyanates in such a way that no cross-linked polyurethane resin is obtained.
  • Component bb) can also contain a proportion of diisocyanates Polyisocyanates with functionalities over two - such as Triisocyanates - contain.
  • Triisocyanates Products proven by trimerization or oligomerization of diisocyanates or by reaction of diisocyanates with polyfunctional compounds containing OH or NH groups. These include, for example the biuret of hexamethylene diisocyanate and water, the isocyanurate of hexamethylene diisocyanate or that Adduct of isophorone diisocyanate with trimethylolpropane.
  • the average functionality can optionally be added by adding monoisocyanates be lowered. Examples of such chain terminating monoisocyanates are phenyl isocyanate and cyclohexyl isocyanate and stearyl isocyanate
  • the Polyurethane resin a) should have an acid number of 10 to 60, preferably 20 to 35. From the acid number, the amount of groups capable of forming anions to be introduced into the polyurethane molecules.
  • Groups capable of forming anions are introduced into the polyurethane molecules by incorporation of compounds cc) in the polyurethane molecules, the at least one isocyanate reactive and contain a group capable of forming anions in the molecule.
  • Suitable groups which are reactive toward isocyanate groups are, in particular, hydroxyl groups and primary and / or secondary amino groups.
  • Suitable groups capable of forming anions are carboxyl, sulfonic acid and / or phosphonic acid groups, carboxyl groups being preferred.
  • component cc for example, alkanoic acids with two substituents on ⁇ -carbon atoms can be used.
  • the substituent can be a hydroxyl group, an alkyl group or preferably an alkylol group. These alkanoic acids have at least one, generally 1 to 3 carboxyl groups in the molecule.
  • component cc) are dihydroxypropionic acid.
  • a particularly preferred group of alkanoic acids are the ⁇ , ⁇ -dimethylolalkanoic acids of the general formula R 4 -C (CH 2 -OH) 2 -COOH, where R 4 represents a hydrogen atom or an alkyl group having up to about 20 carbon atoms.
  • Examples of such compounds are 2,2-dimethylol acetic acid, 2,2-dimethylol propionic acid, 2,2-dimethylol butyric acid and 2,2-dimethylolpentanoic acid.
  • the preferred dihydroxyalkanoic acid is 2,2-dimethylolpropionic acid.
  • Compounds containing amino groups are, for example, ⁇ , ⁇ -diaminovaleric acid, 3,4-diaminobenzoic acid, 2,4-diaminotoluenesulfonic acid and 2,4-diamino-diphenyl ether sulfonic acid.
  • the polyurethane resins a) used can optionally also contain hydroxyl and / or amino groups containing organic compounds with a molecular weight of 40 to 400, or a mixture of such compounds are produced (component dd)).
  • component dd leads to an increase in molecular weight of the polyurethane resins.
  • polyols with up to 20 carbon atoms per molecule such as ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,2-butylene glycol, 1,6-hexanediol, trimethylolpropane, castor oil or hydrogenated castor oil, ditrimethylolpropane ether, Pentaerythritol, 1,2-cyclohexanediol, 1,4-cyclohexanedimethanol, bisphenol A, bisphenol F, neopentyl glycol. hydroxypivalate, hydroxyethylated or hydroxypropylated bisphenol A, hydrogenated bisphenol A and their mixtures are used.
  • the polyols are generally obtained in amounts of up to 30% by weight, preferably 2 to 20% by weight to the amount of component aa) and dd) used. Di- and / or can also be used as component dd)
  • Polyamines with primary and / or secondary amino groups can be used. Polyamines are essentially alkylene polyamines having 1 to 40 carbon atoms, preferably about 2 to 15 carbon atoms. You can use substituents wear that have no hydrogen atoms reactive with isocyanate groups. Examples are polyamines with linear or branched aliphatic, cycloaliphatic or aromatic structure and at least two primary Amino groups.
  • Hydrazine ethylenediamine, propylenediamine, 1,4-butylenediamine, piperazine, 1,4-cyclohexyldimethylamine, 1,6-hexamethylenediamine, trimethylhexamethylenediamine, methanediamine, isophoronediamine, 4,4'-diaminodicyclohexylmethane and aminoethyl ethernolamine.
  • Preferred diamines are hydrazine, alkyl or Cycloalkyldiamines such as propylenediamine and 1-amino-3-aminomethyl-2,5,5-trimethylcyclohexane.
  • polyamines are used as component dd) which contain more than two amino groups in the molecule.
  • felling is e.g. by using monoamines to ensure that no crosslinked polyurethane resins be preserved.
  • useful polyamines are diethylenetriamine, triethylenetetramine, dipropylenetriamine and dibutylenetriamine.
  • An example of a monoamine is ethylhexylamine.
  • component a) is part of the prior art and is e.g. in U.S. Patent 4,719,132, DE-OS 3628124, EP-A-89497, EP-A-256540 and WO 87/03829 are described in detail.
  • ammonia and / or amines in particular alkylamines
  • amino alcohols and cyclic amines such as di- and triethylamine, dimethylaminoethanolamine, diisopropanolamine, morpholine, N-alkylmorpholine
  • Volatile amines are preferred for neutralization.
  • binder to pigment or filler It is particularly important to pay attention to the ratio of binder to pigment or filler. This is between 0.5: 1 and 1.5: 1 according to the solution according to the invention. The range between 0.6: 1 and 1.2: 1.
  • Talc has proven itself as a pigment or filler. Its share in the total amount of pigments and Fillers are 20 to 80% by weight. The range from 30 to 70% by weight is preferred.
  • aminoplast resins are well known to those skilled in the art and are sold by many companies offered.
  • Aminoplast resins are condensation products made from aldehydes, in particular formaldehyde and for example Urea, melamine, guanamine and benzoguanamine.
  • the aminoplast resins preferably contain alcohol Methylol groups, which are generally partially or preferably completely etherified with alcohols.
  • Polyisocyanate crosslinking agents can also be contained in the coating layer formulation. Their shares are regularly below 30% by weight, preferably below 10% by weight. The crosslinker reactivity is generally lower than 130 degrees Celsius.
  • the material can be overcoated with basecoat or clearcoat and baked at 130 degrees Celsius.
  • basecoat or clearcoat With a color matching of the paint formulation according to the invention on the basecoat it is even possible to reduce the layer thicknesses even further without it a loss of quality comes.
  • the paint formulations can all be known per se in paint technology
  • Auxiliaries and additives, such as organic acids, other pigments and fillers, leveling agents, etc. contain.
  • the person skilled in the art can easily produce aqueous stoving lacquers with the aid of the lacquers according to the invention Stone chip intermediate ground and / or can be used as a filler.
  • aqueous varnishes can also be produced that are suitable for other applications.
  • the coating formulation can be prepared by methods known per se, for example by spraying, brushing, Dipping, flooding, knife coating or rolling on any substrates, such as Metals, plastics, wood or glass applied become.
  • the substrates to be painted can be provided with suitable primers.
  • the methyl ethyl ketone is then distilled off at 50 to 60 degrees C in vacuo from the aqueous dispersion thus obtained.
  • the pH of the dispersion is then adjusted to 7.2 with dimethylethanolamine and the solids content of the dispersion to 36.7% by weight with distilled water.
  • aqueous polyurethane dispersions with deionized water, a commercially available leveling agent based on a water-dilutable Acrylic resin, with a solution of a commercially available antifoam based on an unsaturated branched Diols, dissolved in butyl diglycol and N, N-dimethylethanolamine and treated with post-treated titanium dioxide of the rutile type and talc and a commercially available flame black.
  • This mixture is discontinuous Laboratory sand mill filled and dispersed until a fineness of max. 10 ⁇ m in a Hegmann grindometer is reached.
  • the dispersion mixtures are then added with further polyurethane resin dispersion and butyl diglycol the aqueous varnish I prepared with N, N-dimethylethanolamine at a pH of 7.2 to 7.5 and with deionized water to a spray viscosity of 33 sec (DIN 4) is set.
  • Lacquer II and III are produced according to lacquer I. The proportions by weight are shown in the table.
  • the paints are applied using an electrostatic high-speed rotation system (Behr Ecobell, 45000 U / min, outflow rate: 120 ml / min, voltage: 60 kV) in one application with a dry film thickness of 15 microns on with a commercial electrophoretic paint sprayed coated phosphated steel sheets.
  • the application took place at an air temperature of 23 degrees Celsius and a relative air humidity of 60%.
  • the sprayed panels were 5 flashed off at 23 degrees Celsius. It is then pre-dried for 5 minutes at 70 degrees Celsius in a forced air oven.
  • a commercially available silver aqueous metallic basecoat is used electrostatically coated with a dry film thickness of 14 ⁇ m.
  • the basecoat layer thus obtained is after a Flash-off time of 5 minutes at 23 degrees Celsius and subsequent pre-drying of 5 minutes at 70 degrees Celsius in one Circulating air dryer with a commercially available two-component clear lacquer with a dry film density of 35 to 40 ⁇ m painted over. The entire paint is then baked at 130 degrees Celsius for 30 minutes.
  • a color-compatible red aqueous basecoat is used electrostatically a dry film density of 16 microns. Otherwise the procedure is as described.
  • the paintwork obtained showed a very good flow and covered the structure of the electrocoating very well and showed a good intermediate adhesion to the electrocoat primer.
  • the stone chip resistance of the coatings produced according to the invention is despite the reduced layer thickness at least as high as the stone chip resistance of coatings produced according to DE-A-4O05961 have been.
  • aqueous varnish I aqueous paint II aqueous paint III
  • Polyurethane dispersion 1 30.00 30.00 30.00 leveling agents 0.60 0.60 0.60 deionized water 10.00 12,00 10.00 Anti-foaming agents 2.00 2.00 2.00 N, N-dimethylethanolamine 0.10 0.10 0.10 Titanium dioxide 5.00 1.00 5.00 talc 10.00 10.00 10.00 Blanc Fixe (Sachtleben) 4.00 0.00 4.00 Bayferrox 180 (Bayer) 0.00 2.00 0.00 Bayferrox 130 (Bayer) 0.00 4.00 0.00 Paliogenmarron L4020 (BASF) 0.00 2.00 0.00 Aerosil R972 (Degussa) 0.20 0.20 0.20 lamp black 0.50 0.20 0.50 Dispergiermischung 62.40 64,10 62.40 34,00 34,00 32,00 Polyurethane resin dispersion I Cymel 327 (cyanamide) 0.00 0.00 2.00 diglycol

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Claims (7)

  1. Procédé pour la préparation de peintures à plusieurs couches, dans lequel
    1) le substrat est revêtu d'une peinture électrophorétique appliquée par immersion,
    2) la couche de peinture électrophorétique appliquée par immersion appliquée dans l'étape 1 est le cas échéant préséchée et cuite au four,
    3) la couche de peinture électrophorétique appliquée par immersion est revêtue par un premier vernis aqueux,
    4) la couche de vernis appliquée dans l'étape 3 est le cas échéant préséchée et revêtue sans étape de cuisson par un deuxième vernis aqueux,
    5) la couche de vernis appliquée dans l'étape 4 est le cas échéant recouverte par un vernis transparent et
    6) l'ensemble des peintures est cuit au four,
    caractérisé en ce qu'on utilise dans l'étape 3 une composition de couche de vernis qui contient
    a) un liant qui est constitué d'une résine polyuréthane pouvant être diluée dans l'eau, qui présente un indice d'acide de 10 à 60 et un poids moléculaire arithmétique moyen de 4000 à 25000, de préférence de 8000 à 25000, et qui peut être préparé en ce qu'on transforme l'un avec l'autre
    aa) un polyesterpolyol et/ou un polyétherpolyol présentant un poids moléculaire arithmétique moyen de 400 à 5000 ou un mélange de ces polyesterpolyols et/ou polyétherpolyols,
    bb) un polyisocyanate ou un mélange de polyisocyanates,
    cc) un composé qui présente au moins un groupement réactif avec les groupements isocyanate et au moins un groupement capable de former des anions dans la molécule ou un mélange de ces composés et, le cas échéant,
    dd) un composé organique contenant des groupements hydroxyle et/ou amino présentant un poids moléculaire de 40 à 400 ou un mélange de ces composés et le produit de réaction formé est au moins partiellement neutralisé et
    b) des pigments et/ou des charges, le rapport liant à pigment ou, selon le cas, charge étant compris entre 0,5:1 et 1,5:1, et
    c) jusqu'à 5% en poids de résine aminoplaste et
    en ce que la composition de la couche de vernis dans l'étape 3 est appliquée en une épaisseur de couche inférieure à 15 µm et que les pigments et/ou les charges de la formulation de la couche de vernis appliquée dans l'étape 3 contiennent entre 20 et 80% en poids de talc, par rapport à la quantité totale de pigments et de charges.
  2. Procédé selon la revendication 1, caractérisé en ce que le rapport liant à pigment ou, selon le cas, charge dans la composition de la couche de vernis appliquée dans l'étape 3 est compris entre 0,6:1 et 1,2:1.
  3. Procédé selon l'une quelconque des revendications 1 à 2, caractérisé en ce que la proportion de talc est comprise entre 30 et 70% en poids.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la composition de la couche de' vernis appliquée dans l'étape 3 contient des réticulants de polyisocyanate.
  5. Procédé selon la revendication 4, caractérisé en ce que la composition de la couche de vernis appliquée dans l'étape 3 contient jusqu'à 30% en poids de réticulant de polyisocyanate.
  6. Procédé selon la revendication 5, caractérisé en ce que la composition de la couche de vernis appliquée dans l'étape 3 contient jusqu'à 10% en poids de réticulant de polyisocyanate.
  7. Procédé selon l'une quelconque des revendications 4 à 6, caractérisé en ce que la réactivité du réticulant est inférieure à 130°C.
EP95936547A 1994-10-28 1995-10-25 Procédé de fabrication de revêtements multicouches Expired - Lifetime EP0788523B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4438504A DE4438504A1 (de) 1994-10-28 1994-10-28 Lackschichtformulierung zur Verwendung in wässrigen Mehrschichtlacksystemen
DE4438504 1994-10-28
PCT/EP1995/004188 WO1996013537A1 (fr) 1994-10-28 1995-10-25 Composition de couche de vernis utilisable dans des systemes aqueux a couches multiples de vernis

Publications (3)

Publication Number Publication Date
EP0788523A1 EP0788523A1 (fr) 1997-08-13
EP0788523B1 EP0788523B1 (fr) 2000-01-05
EP0788523B2 true EP0788523B2 (fr) 2002-11-27

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EP95936547A Expired - Lifetime EP0788523B2 (fr) 1994-10-28 1995-10-25 Procédé de fabrication de revêtements multicouches

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US (1) US6221949B1 (fr)
EP (1) EP0788523B2 (fr)
JP (1) JP3834599B2 (fr)
KR (1) KR970707193A (fr)
AT (1) ATE188495T1 (fr)
BR (1) BR9509440A (fr)
DE (2) DE4438504A1 (fr)
ES (1) ES2143656T5 (fr)
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JPH10507791A (ja) 1998-07-28
ZA958889B (en) 1996-05-20
US6221949B1 (en) 2001-04-24
WO1996013537A1 (fr) 1996-05-09
ES2143656T5 (es) 2009-11-18
DE59507587D1 (de) 2000-02-10
EP0788523B1 (fr) 2000-01-05
BR9509440A (pt) 1999-10-26
EP0788523A1 (fr) 1997-08-13
ES2143656T3 (es) 2000-05-16
KR970707193A (ko) 1997-12-01
DE4438504A1 (de) 1996-05-02
JP3834599B2 (ja) 2006-10-18

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